Chain.



PATENTED MAY 24, 1904.

IIIIIIV',

J. M. DODGE. CHAIN. muron nun a No. 761,036.

Patented May 24, 1904.

PATENT OFFICE.

JAMES M. DODGE, OF PHILADELPHIA, PENNSYLVANIA.

CHAIN.

SPECIFICATION forming part of Letters Patent No. 761,036, dated May 24,1904. Application filed \pril 5, 1904. Serial No. 201,701. (No model.)

To all whmn it may concern:

struct the means as to disconnect the pivotpin from the retaining means.These objects I attain in the following manner, reference being had tothe accompanying drawings, in which- Figure 1 is a sectional plan Viewon the line 1 1, Fig. 2, of a chain illustrating my invention. Fig. 2 isa side view of a chain, partly in section on the line 2 2, Fig. 1. Fig.3 is a detached perspective View of one of the links of the chain. Fig.4 is a perspective view of one of the caps. Fig. 5 is a perspective view'of the pivot-pin. Fig. 6 is a detached perspective view of the rodwhich passes through the pivot-pin and is attached to the caps. Fig. 7is a section on the line 7 7, Fig. 8, illustrating a modification of myinvention. Fig. 8 is a section on the line 8 8, Fig. 7 Figs. 9 and 10are views illustrating my invention in connection with ordinary chains.

I have illustrated my invention in connection with a special formof'chain which is fully illustrated and claimed in an application forpatent filed by me on the 17th day of March, 1904, Serial No. 198,655.

A and B are two enchained links. B is a single link, and A is a doublelink consisting of two link elements A A. The link B has two segmentallateral projections 56, while each link element A has a segmentallateral projection a, as shown, forming extensions of the bearings ofthe links. In the present instance segmental bushings c c are mounted onthese bearings, the bushing 0 being mounted on the bearings of theelements of the link A, while the bushing c is mounted on the bearing ofthe link B.

D is a pivot-pin upon which the two links of the chain articulate.

In order to hold the link elements A A in alinement with the link B andalso to hold the pivot-pin laterally, I mount on each link element A acap E. The two caps are held together by a rod F, which passes throughan opening d in the pivot-pin and through countersunk openings 6 in eachcap in the present instance, and the ends f f of the rod are headed byriveting, so as to make the fastening permanent.

Each link element A has a segmental recess a, into which extends asegmental rib c of the cap E. This rib is disconnected at 0 so as toallow the projection c to enter the space between the ends of the rib tolock the cap against rotary motion in respect to the link elements. Eachcap is recessed at c to accommodate the ends of the pivot-pin D. Thepivot-pin, however, fits loosely within this recess, as well as looselyupon the rod F, which passes freely through the opening (Z in thepivot-pin. By this construction the rod and its two caps turn with thelink A, while the pivot-pin is free to turn independent of either link.

By the construction above described a plain pivot-pin can be used ofhard metal, if desired, and may be less in diameter than pins heretoforemade for the same strength i of chain, as the pin is only subjected to acrushing strain. The construction of the link as shown also makes thechain perfectly balanced, although this feature does not form a part ofthis invention, being claimed in the application alluded to above.

In Figs. 7 and 8 I have shown a solid pivotpin D and two rods F, securedto the two caps E, the rods being mounted in the space which is allowedfor the free articulation of the links on the pivot-pin, the rods beingso placed as not to interfere with the free movement of the links.

In Fig. 9 I have shown an ordinary chain having link elements A and Bcoupled together by a pivot-pin D Caps E are mounted on each end of thepivot-pin D and overlap the link elements A being secured together by arod F passing freely through the pivotpin. In this instance the rodinstead of being bolted has a head at one end and is screwthreaded atthe opposite end, to which is applied a nut f.

A jam-nut or cotter-pin may be used to lock the nut, or a washer andcotter-pin may be substituted for the nut, if desired.

Fig. 10 is a view showing two links A" and B", the link A being forkedto receive the end of the link B A pivot-pin D couples the two linkstogether, and caps E are used,which are tied together by a transverserod F.

It will be understood that my invention can be applied to a simpleconnection of two links or may be applied to a chain in which the linksare each made up of a series of link elements.

I claim as my invention 1. The combination of two links, a pivot-pintherefor, two caps arranged to turn with one link, and a transversetie-rod coupling the two caps, substantially as described.

2. The combination of twolinks, apivot-pin therefor, two caps, asegmental flange on each cap, a projection on each side of one linkentering recesses in the caps to prevent them moving independently ofthe said link, and a tie-rod coupling the caps, substantially asdescribed.

3. The combination in a chain, of two links, a pivot-pin therefor, saidpivot-pin having a central opening throughout its entire length, a capat each end of the pivot-pin, a rod passing through the hole in thepivot-pin and attached to the caps, substantially as described.

4:. The combination of two links, a pivot-pin therefor, said pivot-pinhaving an opening throughout its entire length, a cap at eachv end 4 ofthe pivot-pin extending over one link and connected thereto so as tomove therewith, and a tie-rod connecting the two caps, said hole throughthe pivot-pin being larger than the rod so as to allow the pivot-pin toturn independently of the rod, substantially as described.

5. The combination of two links, a pivot-pin therefor, having a centralopening extending the full length of the pivot-pin, a cap at each end ofthe pivot-pin locked to one link so as to turn therewith, a tie-rodextending freely through the opening in the pivot-pin and throughopenings in the caps, and having a riveted head at each end thereof,substantially as described.

6. The combination of two links, apivot-pin therefor,a cap at each endof the pivot-pin, each cap recessed for the reception of the pivot-pin,-

to this specification in the presence of two subscribing witnesses.

JAMES M. DODGE. Witnesses:

WILL. A. BARR, J os. H. KLEIN.

